connect to database using database checkpoint,database 
output value(connection string is needed)

Through scripting this is way to connect the database
Example:-

set conn=Createobject("ADODB.Connection") 
Srvname="Driver={Microsoft ODBC for 
Oracle}:Server=DBserver,UID=Sa,Password=sa" 
conn.open Srvname 
Set Rec = CreateObject("ADODB.Recordset") 
SQL="select * from Users" 
Rec.open SQL ,conn 
Username=Rec.fields("employee name") 
Msgbox Username

Thanks murali...
What is 'ADODB', 'Recordset' and wht we have to give 
in 'Srvname'?

Microsoft ADO (ActiveX Data Objects) is a Component object 
model object for accessing data sources.The ADO Recordset 
object is used to hold a set of records from a database 
table. A Recordset object consist of records and columns 
(fields).
In ADO, this object is the most important and the one used 
most often to manipulate data from a database.

Srvname is a connection string.if u already installed 
oracle in your system..using that path u can connect oracle 
database...if u dont have oracle give the conncetion string 
path..whatever connection string created used in database 
checkpoint by 
default...Example:DSN=QT_Flight32;DBQ=C:\Program 
Files\Mercury Interactive\QuickTest 
Professional\samples\flight\app\flight32.mdb;Driver=C:\WINDO
WS\system32\odbcjt32.dll;DriverId=281;FIL=MS 
Access;MaxBufferSize=2048;PageTimeout=5;

Dim con,rs
set con=createobject("ADODB.Connection")
set rs=createobject("ADODB.Recordset")
con.provider="Microsoft.jet.oledb.4.o"
con.open"Path of the database"
rs.open "select * (table name),con

Thru Self scripting:
set conn=createobject("adodb.connection")
set rs=createobject("adodb.recordset")
' Oracle client is required to be installed on your box
conn.open= "Provider=OraOLEDB.Oracle.1;Password=***;Persist
Security Info=True;User ID=****;SERVER=****;Data
Source=****;DBQ=****;"
sql="your sql"
rs.open sql,conn

rs.close
set rs=nothing

conn.close
set conn=nothing

Dim ObjCon, ObjResult, ObjSQL
set ObjCon=Createobject("ADODB.Connection") 
ObjCon.ConnectionString("DSN= ,UID= ,PWD= ")
ObjSQL="SELECT * FROM Emp"
ObjCon.Open()
ObjResult=ObjCon.Execute(ObjSQL)
ObjCon.Close()
ObjResult=Nothing

whtever ur data stored in ObjResult variable